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All-Optical Noninvasive Delayed Feedback Control of Semiconductor Lasers
The stabilization of unstable states hidden in the dynamics of a system, in particular the control of chaos, received much attention in the last years. In this work, a well-known control method called delayed feedback control is applied for the first time entirely in the all-optical domain. A multisection semiconductor laser receives optical feedback from an external Fabry-Perot interferometer. The control signal is a phase-tunable superposition of the laser signal, and provokes the laser to operate in an otherwise unstable periodic state with a period equal to the time delay. The control is noninvasive, because the reflected signal tends to zero when the target state is reached.
Control of Complex Nonlinear Systems with Delay
This research addresses delay effects in nonlinear systems, which are ubiquitous in various fields of physics, chemistry, biology, engineering, and even in social and economic systems. They may arise as a result of processing times or due to the finite propagation speed of information between the constituents of a complex system. Time delay has two complementary, counterintuitive and almost contradictory facets. On the one hand, delay is able to induce instabilities, bifurcations of periodic and more complicated orbits, multi-stability and chaotic motion. On the other hand, it can suppress instabilities, stabilize unstable stationary or periodic states and may control complex chaotic dynamics. This thesis deals with both aspects, and presents novel fundamental results on the controllability of nonlinear dynamics by time-delayed feedback, as well as applications to lasers, hybrid-mechanical systems, and coupled neural systems.
Handbook of Chaos Control
This long-awaited revised second edition of the standard reference on the subject has been considerably expanded to include such recent developments as novel control schemes, control of chaotic space-time patterns, control of noisy nonlinear systems, and communication with chaos, as well as promising new directions in research. The contributions from leading international scientists active in the field provide a comprehensive overview of our current level of knowledge on chaos control and its applications in physics, chemistry, biology, medicine, and engineering. In addition, they show the overlap with the traditional field of control theory in the engineering community. An interdisciplinary approach of interest to scientists and engineers working in a number of areas.
Plants as alternative hosts for human and animal pathogens
Many of the most prevalent and devastating human and animal pathogens have part of their lifecycle out-with the animal host. These pathogens have a remarkably wide capacity to adapt to a range of quite different environments: physical, chemical and biological, which is part of the key to their success. Many of the well-known pathogens that are able to jump between hosts in different biological kingdoms are transmitted through the faecal-oral and direct transmission pathways, and as such have become important food-borne pathogens. Some high-profile examples include fresh produce-associated outbreaks of Escherichia coli O157:H7 and Salmonella enterica. Other pathogens may be transmitted via di...
Menschen am Kaiserdamm
Der Kaiserdamm ist nicht berühmt, aber laut. Um 1900 wurde er als schnurgerade Prachtallee erdacht und mit Kaisers Gnaden aus dem Boden gestampft. Ufa-Stars und Nazigrößen wohnten hier, Alfred Döblin betrieb am Kaiserdamm seine Arztpraxis. Großbürgerliches Leben in der »Villa auf einer Etage« war typisch. Oliver Ohmann spürt den Menschen nach, die in dieser Großstadtstraße gelebt haben, und erzählt ihre Geschichten – vom Kaiserreich bis zur Coronakrise. Er ist selbst ein Kind des Kaiserdamms. 30 prägende Jahre lebte er dort. Sein Bericht ist auch eine Liebeserklärung – an die Art zu leben, die nur in einer Stadt wie Berlin möglich ist.
Multilateral Interactions In The Rhizosphere
The rhizosphere is an ecological hotspot. Plant roots, bacteria, archaea, fungi, nematodes, and other macroscopic organisms interact here with each other. Plants represent the main influencing force as they produce a mixture of chemical molecules and extrude them in the form of root exudates. Those exudates determine not only the nutrient availability of the plant but also influence the outcome of the interactions in the vicinity of the roots. In response to the plant-derived signals, a subset of the bulk soil microbes can proliferate in the proximity of the root and some of them can eventually overcome the plant defense system to colonize the plants. The root-associated microbiota is assume...
Music at Michigan
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Microbes in Microbial Communities
The book overviews the complex interactions amongst the microbes and their possible applications. Emphasis has been made to include a wide spectrum of experimental and theoretical contributions from eminent researchers in the field. Microbial communities are the assemblages of microorganisms of various species which live together in the same environment and continuously interact with each other. The microbial cells in communities display unique phenotypes that affect the survival and reproduction of other cells present around them. These phenotypes constitute the social adaptations that drive the interactions between microbial cells. The interactions, further determine the productivity, stab...
Theories of Africans
"Situating literature and anthropology in mutual interrogation, Miller's...book actually performs what so many of us only call for. Nowhere have all the crucial issues been brought together with the sort of critical sophistication it displays."—Henry Louis Gates, Jr. ". . . a superb cross-disciplinary analysis."—Y. Mudimbe
